Thread: Synthetic sleeping bag for (west coast) autumn/winter Tahr-hunting?

Given the weight and massive pack size of synthetic bags, 1250g for a 0deg comfort rated Rab bag, I would opt for a down bag with a water resistant outer - something like pertex - and hydrophobic treated down. Even with those you can add a bivvy bag to this (~300g), which would still weigh less and give you more versatility in the future.
Unless you are sleeping in a downpour and lying in a puddle that set up should be pretty alright.
My 2c